<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>一列布局</title>
<style type="text/css">
body{ 
	margin:0; 
	padding:0; 
	font-size:30px;
}
div{ 
	text-align:center; 
	font-weight:bold;
}
.main,.footer{ 
	width:960px;
	margin: 0 auto;
}
.head{ 
	width:100%; 
	height:100px; 
	background:#ccc;
}
.main{ 
	height:400px; 
	background:#FCC;
}
.footer{ 
	height:100px; 
	background:#9CF;
}
</style>
</head>

<body>
<div class="head">head</div>
<div class="main">main</div>
<div class="footer">footer</div>
</body>
</html>